import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int x = sc.nextInt();
        int y = sc.nextInt();
        if(Math.max(x,y)>6 || Math.min(x,y)<-6){
            System.out.println("NO");
            return;
        }
        boolean [][][] b = new boolean[4][13][13];
        b[0][6][6]=true;
        for(int k=0; k<3; k++){
        for(int i=2; i<11; i++){
            for(int j=2; j<11; j++){
                if(b[k][i][j]){
                    b[k+1][i+2][j+1]=true;
                    b[k+1][i+2][j-1]=true;
                    b[k+1][i+1][j+2]=true;
                    b[k+1][i+1][j-2]=true;
                    b[k+1][i-1][j+2]=true;
                    b[k+1][i-1][j-2]=true;
                    b[k+1][i-2][j+1]=true;
                    b[k+1][i-2][j-1]=true;
                }
            }
        }
        }
        for(int k=0; k<3; k++){
            if(b[k][x+6][y+6]){
                System.out.println("YES");
                return;
            }
        }
        System.out.println("NO");
    }
}